When treating definitive bladder cancer, would you ever utilize a bladder boost first, prior to the larger bladder/pelvic field?

The ongoing NRG/SWOG phase III trial S1806 comparing chemoradiation to chemoradiation plus atezolizumab for MIBC does allow patients to receive their boost prior to the large-field phase of radiation therapy. I too have found that patient compliance with bladder filling is easier at the start of rad...